… Visual signals are a product of signaler's reflectance spectrum and ambient light (Endler
1990) and so are strongly dependent upon the environment. If the ambient light spectrum …

… These are the purposes of John Endler's book. In it, he discusses the methods and problems
… Professor Endler finds that there are a remarkable number of direct demonstrations of …

… (JA Endler, unpublished manuscript). Forest shade results when most of the light reaching
the surface of an animal or background has been transmitted through or reflected from …

… INTRODUCTION 1969, 1971), and the present author (see Chapter 4, and Endler 1973b),
show that quite marked differentiation may evolve quickly in spite of high levels of gene flow. …

… Guppies (Poecilia reticulata Peters) show a complex color pattern polymorphism which
varies with predation pressure, and are excellent for a study of natural selection on a …

… 95% or more of the variance (Endler, unpublished). For example, … Very similar results were
obtained with other data sets (Endler, … ENDLER, JA, 1978. A predator's view of animal colour …

It has long been known that the general colors and tones of animals tend to match their
backgrounds (E. Darwin, 1794; Poulton, 1890). The adaptive significance of this has been borne …

LIFE-HISTORY theory predicts that reduced adult survival will select for earlier maturation
and increased reproductive effort; conversely, reduced juvenile survival will select the …

… 1); these sites are a subset of the locations studied by Endler (1978, 1980, and unpubl.).
The collections include four Aequidens, five Rivulus, and seven Crenicichla sites. The variation …

During courtship, signals are sent between the sexes, and received signals contain information
that forms the basis of decision making. Much is known about signal content, but less is …